An NMR thermometer for cryogenic magic-angle spinning NMR: the spin-lattice relaxation of 127I in cesium iodide
Sarkar, Riddhiman, Concistre, Maria, Johannessen, Ole G., Beckett, Peter, Denning, Mark, Carravetta, Marina, al-Mosawi, Maitham, Beduz, Carlo, Yang, Yifeng and Levitt, Malcolm H. (2011) An NMR thermometer for cryogenic magic-angle spinning NMR: the spin-lattice relaxation of 127I in cesium iodide. Journal of Magnetic Resonance, 212, (2), 460-463. (doi:10.1016/j.jmr.2011.08.021).
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The accurate temperature measurement of solid samples under magic-angle spinning (MAS) is difficult in the cryogenic regime. It has been demonstrated by Thurber et al. (J. Magn. Reson., 196 (2009) 84-87)  that the temperature dependent spin-lattice relaxation time constant of 79Br in KBr powder can be useful for measuring sample temperature under MAS over a wide temperature range (20–296 K). However the value of T1 exceeds 3 min at temperatures below 20 K, which is inconveniently long. In this communication, we show that the spin-lattice relaxation time constant of 127I in CsI powder can be used to accurately measure sample temperature under MAS within a reasonable experimental time down to 10 K.
|Keywords:||solid state NMR, magic angle spinning (MAS), temperature measurement|
|Subjects:||Q Science > QD Chemistry
T Technology > TP Chemical technology
|Divisions:||Faculty of Natural and Environmental Sciences > Chemistry
Faculty of Engineering and the Environment > Engineering Sciences
|Date Deposited:||20 Apr 2012 10:43|
|Last Modified:||14 Apr 2014 11:39|
Cryogenic static and magic-angle spinning nuclear magnetic resonance on superconductors
Funded by: EPSRC (EP/H048642/1)
Led by: Marina Carravetta
20 September 2010 to 19 March 2012
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